Volume 6, Number 4, December, 1998 - Noise News International

CONTROL
The illustrations in thisfeature articleappearedfirst in a book published in Swedish
by Arbetarskyddsfonden, the Swedish Work Environment Fund. The Fund was establishedbynationallegislation
inSwedento conductresearch and educationinthefield of
workenvironment improvement, and isjointly operatedby Swedishemployersand labor
unions.
The book was translated into English and disseminated as a guidefor workers and
employers by the U.S. Department ofLabor. It has also been translated into other languages,
notably Finnish and Danish, but its overall circulation has been limited. The
illustrations are being republished here to give them wider circulation, particularly
among noise control engineers.
The formulation ofthe principles, the choice ofexamples and the preparation of
preliminary sketches was the work of Stig Ingemansson. The original illustrations
were prepared by Claes Folkesson.
The principles and practice ofnoise control are presented in eight sections:
Principles
and
Practice
(Pari 14)
A. Sound behavior
B. Soundfrom vibrating plates
C Sound production in air or gases
D. Sound production inflowing liquids
F Sound propagation indoors
F Sound propagation in ducts
G. Soundfrom vibrating machines
H. Sound reduction by enclosure walls.
The text of the U.S. Department of Labor translation has been checked and improvedby
the author. The illustrationsare beingpublished serially in NoiselNews International.
Illustrations Al through A4 appeared in NNI, Vol 2 No.2, 1994 June,
pages 108-115. Illustrations A5 throughA8 appeared in NNI, Vol2. No.3, 1994 September,
pages 185-193. Illustrations Bl through B3 appeared in NNI, Vol. 2, No.4,
1994 December, pages 244-249. Illustrations B4 through B6 appeared in NNI, Vol. 3,
No.1, 1995 March, pages 46-51. Illustrations B7 through C2 appeared in NNI, Vol. 3,
No.2, 1995 June, pages 120-127.Illustrations C3 throughC5 appeared inNNI, Vol. 3,
No.3, 1995 September, pages 178-183. Illustrations C6 throughD1 appeared in NNI,
Vol. 3, No.4, 1995 December, pages 238-243. IllustrationsD2 throughE2 appeared in
Nl\'l, Vol. 4, No.1, 1996 March, pages 40-45. Illustrations E3 through1"1 appeared in
Nl\'l, Vol. 4, No. 3,pages 160-167.Illustrations1"2 and 1"3 appeared inNNI, Vol. 4, No.
4, pages 226-229. Illustrations 1"4 and 1"5 appeared in NNI, Vol. 5, No.3, pages 158­
61. Illustrations 1"6 and G1 appeared in NNI, Vol. 6, No.1, 1998 March, pages 38-41.
Illustrations G2 through G5 appeared in NNI, Vol., 6, No.3, pages 158-165. IllustratiO'IS
appearing in this issue are the following:
G6. Sound through connections must be blocked.
HI. The TL ofa single wall is estimated from its surface weight.
H2. A singlewall providespoor sound insulationaround a certainfrequency.
Stig Ingemansson is the founder of
Sweden's leading consulting firm in
acoustics. He was a lecturer in acoustics
for many years at Chalmers University of
Technology, Gothenburg, Sweden, and
recently received an honorary doctorate
from the university. His address is: Stig
N.P. Ingemansson, DNV Ingemansson AB,
Gullbergs Strandgata 6, Box 276, S-40 124
Gothenburg, Sweden.
These illustrationsshould assist engineers in explaining to others thefundamental
principles ofnoise control. -Ed.
1998 December NoiselNews International 217